SW-116 Robin's EggCone 6 oxidation: Robins Egg is a greenish blue matte glaze that contains a sand colored crystal. As the crystal melts, a small sandy brown bloom will appear in the glaze, producing a mottled, textured finish. Cone 10 reduction: Semi gloss finish with variegated blue light blue and crystals. TIP: SW 105 Frost Blue is the base glaze. For a lighter crystal effect, you may try applying two coats of SW 105 Frost Blue with a third coat of SW 116 Robins